2 * mtu3.h - MediaTek USB3 DRD header
4 * Copyright (C) 2016 MediaTek Inc.
8 * This software is licensed under the terms of the GNU General Public
9 * License version 2, as published by the Free Software Foundation, and
10 * may be copied, distributed, and modified under those terms.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
22 #include <linux/device.h>
23 #include <linux/dmapool.h>
24 #include <linux/extcon.h>
25 #include <linux/interrupt.h>
26 #include <linux/list.h>
27 #include <linux/phy/phy.h>
28 #include <linux/regulator/consumer.h>
29 #include <linux/usb.h>
30 #include <linux/usb/ch9.h>
31 #include <linux/usb/gadget.h>
32 #include <linux/usb/otg.h>
38 #include "mtu3_hw_regs.h"
41 #define MU3D_EP_TXCR0(epnum) (U3D_TX1CSR0 + (((epnum) - 1) * 0x10))
42 #define MU3D_EP_TXCR1(epnum) (U3D_TX1CSR1 + (((epnum) - 1) * 0x10))
43 #define MU3D_EP_TXCR2(epnum) (U3D_TX1CSR2 + (((epnum) - 1) * 0x10))
45 #define MU3D_EP_RXCR0(epnum) (U3D_RX1CSR0 + (((epnum) - 1) * 0x10))
46 #define MU3D_EP_RXCR1(epnum) (U3D_RX1CSR1 + (((epnum) - 1) * 0x10))
47 #define MU3D_EP_RXCR2(epnum) (U3D_RX1CSR2 + (((epnum) - 1) * 0x10))
49 #define USB_QMU_RQCSR(epnum) (U3D_RXQCSR1 + (((epnum) - 1) * 0x10))
50 #define USB_QMU_RQSAR(epnum) (U3D_RXQSAR1 + (((epnum) - 1) * 0x10))
51 #define USB_QMU_RQCPR(epnum) (U3D_RXQCPR1 + (((epnum) - 1) * 0x10))
53 #define USB_QMU_TQCSR(epnum) (U3D_TXQCSR1 + (((epnum) - 1) * 0x10))
54 #define USB_QMU_TQSAR(epnum) (U3D_TXQSAR1 + (((epnum) - 1) * 0x10))
55 #define USB_QMU_TQCPR(epnum) (U3D_TXQCPR1 + (((epnum) - 1) * 0x10))
57 #define SSUSB_U3_CTRL(p) (U3D_SSUSB_U3_CTRL_0P + ((p) * 0x08))
58 #define SSUSB_U2_CTRL(p) (U3D_SSUSB_U2_CTRL_0P + ((p) * 0x08))
60 #define MTU3_DRIVER_NAME "mtu3"
61 #define DMA_ADDR_INVALID (~(dma_addr_t)0)
63 #define MTU3_EP_ENABLED BIT(0)
64 #define MTU3_EP_STALL BIT(1)
65 #define MTU3_EP_WEDGE BIT(2)
66 #define MTU3_EP_BUSY BIT(3)
68 #define MTU3_U3_IP_SLOT_DEFAULT 2
69 #define MTU3_U2_IP_SLOT_DEFAULT 1
72 * Normally the device works on HS or SS, to simplify fifo management,
73 * devide fifo into some 512B parts, use bitmap to manage it; And
74 * 128 bits size of bitmap is large enough, that means it can manage
75 * up to 64KB fifo size.
76 * NOTE: MTU3_EP_FIFO_UNIT should be power of two
78 #define MTU3_EP_FIFO_UNIT (1 << 9)
79 #define MTU3_FIFO_BIT_SIZE 128
80 #define MTU3_U2_IP_EP0_FIFO_SIZE 64
83 * Maximum size of ep0 response buffer for ch9 requests,
84 * the SET_SEL request uses 6 so far, and GET_STATUS is 2
86 #define EP0_RESPONSE_BUF 6
88 /* device operated link and speed got from DEVICE_CONF register */
90 MTU3_SPEED_INACTIVE = 0,
97 * @MU3D_EP0_STATE_SETUP: waits for SETUP or received a SETUP
99 * @MU3D_EP0_STATE_TX: IN data stage
100 * @MU3D_EP0_STATE_RX: OUT data stage
101 * @MU3D_EP0_STATE_TX_END: the last IN data is transferred, and
102 * waits for its completion interrupt
103 * @MU3D_EP0_STATE_STALL: ep0 is in stall status, will be auto-cleared
104 * after receives a SETUP.
106 enum mtu3_g_ep0_state {
107 MU3D_EP0_STATE_SETUP = 1,
110 MU3D_EP0_STATE_TX_END,
111 MU3D_EP0_STATE_STALL,
115 * @base: the base address of fifo
116 * @limit: the bitmap size in bits
117 * @bitmap: fifo bitmap in unit of @MTU3_EP_FIFO_UNIT
119 struct mtu3_fifo_info {
122 DECLARE_BITMAP(bitmap, MTU3_FIFO_BIT_SIZE);
126 * General Purpose Descriptor (GPD):
127 * The format of TX GPD is a little different from RX one.
128 * And the size of GPD is 16 bytes.
131 * bit0: Hardware Own (HWO)
132 * bit1: Buffer Descriptor Present (BDP), always 0, BD is not supported
133 * bit2: Bypass (BPS), 1: HW skips this GPD if HWO = 1
134 * bit7: Interrupt On Completion (IOC)
135 * @chksum: This is used to validate the contents of this GPD;
136 * If TXQ_CS_EN / RXQ_CS_EN bit is set, an interrupt is issued
137 * when checksum validation fails;
138 * Checksum value is calculated over the 16 bytes of the GPD by default;
139 * @data_buf_len (RX ONLY): This value indicates the length of
140 * the assigned data buffer
141 * @next_gpd: Physical address of the next GPD
142 * @buffer: Physical address of the data buffer
144 * (TX): This value indicates the length of the assigned data buffer
145 * (RX): The total length of data received
148 * bit5 (TX ONLY): Zero Length Packet (ZLP),
162 * dma: physical base address of GPD segment
163 * start: virtual base address of GPD segment
164 * end: the last GPD element
165 * enqueue: the first empty GPD to use
166 * dequeue: the first completed GPD serviced by ISR
167 * NOTE: the size of GPD ring should be >= 2
169 struct mtu3_gpd_ring {
171 struct qmu_gpd *start;
173 struct qmu_gpd *enqueue;
174 struct qmu_gpd *dequeue;
178 * @vbus: vbus 5V used by host mode
179 * @edev: external connector used to detect vbus and iddig changes
180 * @vbus_nb: notifier for vbus detection
181 * @vbus_nb: notifier for iddig(idpin) detection
182 * @extcon_reg_dwork: delay work for extcon notifier register, waiting for
183 * xHCI driver initialization, it's necessary for system bootup
185 * @is_u3_drd: whether port0 supports usb3.0 dual-role device or not
186 * @id_*: used to maually switch between host and device modes by idpin
187 * @manual_drd_enabled: it's true when supports dual-role device by debugfs
188 * to switch host/device modes depending on user input.
190 struct otg_switch_mtk {
191 struct regulator *vbus;
192 struct extcon_dev *edev;
193 struct notifier_block vbus_nb;
194 struct notifier_block id_nb;
195 struct delayed_work extcon_reg_dwork;
197 /* dual-role switch by debugfs */
198 struct pinctrl *id_pinctrl;
199 struct pinctrl_state *id_float;
200 struct pinctrl_state *id_ground;
201 bool manual_drd_enabled;
205 * @mac_base: register base address of device MAC, exclude xHCI's
206 * @ippc_base: register base address of IP Power and Clock interface (IPPC)
207 * @vusb33: usb3.3V shared by device/host IP
208 * @sys_clk: system clock of mtu3, shared by device/host IP
209 * @dr_mode: works in which mode:
210 * host only, device only or dual-role mode
211 * @u2_ports: number of usb2.0 host ports
212 * @u3_ports: number of usb3.0 host ports
213 * @dbgfs_root: only used when supports manual dual-role switch via debugfs
214 * @wakeup_en: it's true when supports remote wakeup in host mode
215 * @wk_deb_p0: port0's wakeup debounce clock
216 * @wk_deb_p1: it's optional, and depends on port1 is supported or not
221 void __iomem *mac_base;
222 void __iomem *ippc_base;
225 /* common power & clock */
226 struct regulator *vusb33;
230 struct otg_switch_mtk otg_switch;
231 enum usb_dr_mode dr_mode;
235 struct dentry *dbgfs_root;
236 /* usb wakeup for host mode */
238 struct clk *wk_deb_p0;
239 struct clk *wk_deb_p1;
240 struct regmap *pericfg;
244 * @fifo_size: it is (@slot + 1) * @fifo_seg_size
245 * @fifo_seg_size: it is roundup_pow_of_two(@maxp)
259 struct mtu3_fifo_info *fifo;
261 struct list_head req_list;
262 struct mtu3_gpd_ring gpd_ring;
263 const struct usb_ss_ep_comp_descriptor *comp_desc;
264 const struct usb_endpoint_descriptor *desc;
271 struct mtu3_request {
272 struct usb_request request;
273 struct list_head list;
280 static inline struct ssusb_mtk *dev_to_ssusb(struct device *dev)
282 return dev_get_drvdata(dev);
286 * struct mtu3 - device driver instance data.
287 * @slot: MTU3_U2_IP_SLOT_DEFAULT for U2 IP only,
288 * MTU3_U3_IP_SLOT_DEFAULT for U3 IP
289 * @may_wakeup: means device's remote wakeup is enabled
290 * @is_self_powered: is reported in device status and the config descriptor
291 * @ep0_req: dummy request used while handling standard USB requests
292 * for GET_STATUS and SET_SEL
293 * @setup_buf: ep0 response buffer for GET_STATUS and SET_SEL requests
297 struct ssusb_mtk *ssusb;
299 void __iomem *mac_base;
300 void __iomem *ippc_base;
303 struct mtu3_fifo_info tx_fifo;
304 struct mtu3_fifo_info rx_fifo;
306 struct mtu3_ep *ep_array;
307 struct mtu3_ep *in_eps;
308 struct mtu3_ep *out_eps;
314 struct dma_pool *qmu_gpd_pool;
315 enum mtu3_g_ep0_state ep0_state;
316 struct usb_gadget g; /* the gadget */
317 struct usb_gadget_driver *gadget_driver;
318 struct mtu3_request ep0_req;
319 u8 setup_buf[EP0_RESPONSE_BUF];
322 unsigned is_active:1;
323 unsigned may_wakeup:1;
324 unsigned is_self_powered:1;
325 unsigned test_mode:1;
326 unsigned softconnect:1;
327 unsigned u1_enable:1;
328 unsigned u2_enable:1;
336 static inline struct mtu3 *gadget_to_mtu3(struct usb_gadget *g)
338 return container_of(g, struct mtu3, g);
341 static inline int is_first_entry(const struct list_head *list,
342 const struct list_head *head)
344 return list_is_last(head, list);
347 static inline struct mtu3_request *to_mtu3_request(struct usb_request *req)
349 return req ? container_of(req, struct mtu3_request, request) : NULL;
352 static inline struct mtu3_ep *to_mtu3_ep(struct usb_ep *ep)
354 return ep ? container_of(ep, struct mtu3_ep, ep) : NULL;
357 static inline struct mtu3_request *next_request(struct mtu3_ep *mep)
359 struct list_head *queue = &mep->req_list;
361 if (list_empty(queue))
364 return list_first_entry(queue, struct mtu3_request, list);
367 static inline void mtu3_writel(void __iomem *base, u32 offset, u32 data)
369 writel(data, base + offset);
372 static inline u32 mtu3_readl(void __iomem *base, u32 offset)
374 return readl(base + offset);
377 static inline void mtu3_setbits(void __iomem *base, u32 offset, u32 bits)
379 void __iomem *addr = base + offset;
380 u32 tmp = readl(addr);
382 writel((tmp | (bits)), addr);
385 static inline void mtu3_clrbits(void __iomem *base, u32 offset, u32 bits)
387 void __iomem *addr = base + offset;
388 u32 tmp = readl(addr);
390 writel((tmp & ~(bits)), addr);
393 int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks);
394 struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags);
395 void mtu3_free_request(struct usb_ep *ep, struct usb_request *req);
396 void mtu3_req_complete(struct mtu3_ep *mep,
397 struct usb_request *req, int status);
399 int mtu3_config_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
400 int interval, int burst, int mult);
401 void mtu3_deconfig_ep(struct mtu3 *mtu, struct mtu3_ep *mep);
402 void mtu3_ep_stall_set(struct mtu3_ep *mep, bool set);
403 void mtu3_ep0_setup(struct mtu3 *mtu);
404 void mtu3_start(struct mtu3 *mtu);
405 void mtu3_stop(struct mtu3 *mtu);
406 void mtu3_dev_on_off(struct mtu3 *mtu, int is_on);
408 int mtu3_gadget_setup(struct mtu3 *mtu);
409 void mtu3_gadget_cleanup(struct mtu3 *mtu);
410 void mtu3_gadget_reset(struct mtu3 *mtu);
411 void mtu3_gadget_suspend(struct mtu3 *mtu);
412 void mtu3_gadget_resume(struct mtu3 *mtu);
413 void mtu3_gadget_disconnect(struct mtu3 *mtu);
415 irqreturn_t mtu3_ep0_isr(struct mtu3 *mtu);
416 extern const struct usb_ep_ops mtu3_ep0_ops;